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A small percentage of impurity is added to an intrinsic semiconductor at $300 \: K$. Which one of the following statements is true for the energy band diagram shown in the following figure?

  1. Intrinsic semiconductor doped with pentavalent atoms to form $n$-type semiconductor.
  2. Intrinsic semiconductor doped with trivalent atoms to form $n$-type semiconductor.
  3. Intrinsic semiconductor doped with pentavalent atoms to form $p$-type semiconductor.
  4. Intrinsic semiconductor doped with trivalent atoms to form $p$-type semiconductor.
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